Japanese engineers are considering the possibility they will have to bury some of the reactors, at the Fukushima Daiichi plant.  This was the final action taken by the Soviets with the 1986 Chernobyl disaster.

Sand and concrete would be the main ingredients. The Soviets also used boric acid.  South Korea has sent samples of boric acid to Japan to test for possible use on the reactors.  Japanese officials say they want to continue to attempt to cool down the reactors first.

Japan raised the level of seriousness of the disaster to 5 on the INES scale.  International observers had placed it at 6 last week.  Obviously there is a difference of opinion.  Three Mile Island is rated at 5.  Chernobyl is rated at 7, the highest, on the INES scale.